feat(officialTournament): add auto-registration for tournament participants

- Implemented a new endpoint to automatically register participants for official tournaments using the Click-TT service.
- Added a corresponding method in the frontend to trigger the auto-registration process, enhancing user experience by simplifying participant management.
- Updated the official tournament controller and routes to support the new functionality.

backend/controllers/officialTournamentController.js

@@ -1,5 +1,6 @@
 import { checkAccess } from '../utils/userUtils.js';
 import officialTournamentService from '../services/officialTournamentService.js';
+import clickTtTournamentRegistrationService from '../services/clickTtTournamentRegistrationService.js';
 
 export const updateOfficialTournament = async (req, res) => {
   try {
@@ -116,3 +117,26 @@ export const deleteOfficialTournament = async (req, res) => {
     res.status(500).json({ error: 'Failed to delete tournament' });
   }
 };
+
+export const autoRegisterOfficialTournamentParticipants = async (req, res) => {
+  try {
+    const { authcode: userToken } = req.headers;
+    const { clubId, id: tournamentId } = req.params;
+    const userId = req.user?.id;
+
+    const result = await clickTtTournamentRegistrationService.autoRegisterPendingParticipants({
+      userToken,
+      userId,
+      clubId,
+      tournamentId
+    });
+
+    res.status(200).json(result);
+  } catch (e) {
+    console.error('[autoRegisterOfficialTournamentParticipants] Error:', e);
+    res.status(e.statusCode || e.status || 500).json({
+      success: false,
+      error: e.message || 'Teilnehmer konnten nicht automatisch in click-TT angemeldet werden'
+    });
+  }
+};